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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b66fa5b2e989ab4478796ae4d012adb8be7adf4667126f71846a3c75c1f6479' 
  AND token = '7TmIOvNw7jc6yiCLUt5x+h+9NGO/Bbhn+7drO9Vf9vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}